Exo-dibicycloalkane carboxamides

ABSTRACT

An exo-dibicycloalkanecarboxamide of the structural formula II: wherein n and x are defined as above, and Ha1 is chlorine or bromine, with about 1 molar equivalent of an amine H2N-R1, in which R1 is defined as above. Compounds II have antidiabetic activity and can be used in mammals to treat hyperglycemia.   wherein n has the value of 1 to 3, inclusive; wherein x is zero or 1; and wherein R1 is selected from the group consisting of hydrogen, alkyl of one to six carbon atoms, inclusive, 2-pyridyl, phenyl, and substituted phenyl in which the substituent is alkyl of one to three carbon atoms, inclusive, alkoxy of one to three carbon atoms, inclusive, halogen, nitro or trifluoromethyl, is produced by reacting 2 molar equivalents of a formyl or acetyl exo-bicycloalkanecarbohalide of the formula I

United States Patent Rynbrandt 1 June 27, 1972 [54] EXO-DIBICYCLOALKANE CARBOXAMIDES [72] Inventor: Ronald B. Rylbrndt, Portage, Mich. [731 Assignee: The Upjohn Company, Kalamazoo, Mich.

[221 Filed: Jan. 14, 1971 [21] App]. No.: 106,602

[52] 11.8. CI. ..260/295 AM, 260/557 B, 260/295 D, 260/295 K, 424/320, 424/263 511 Int. Cl. ..C07d 31/44,C07c 103/19 [58] Field otSeaneh ....'.....260/557 B, 295 AM, 295 R, 295 D [56] References Cited v UNITED STATES PATENTS 2,681,931 6/1954 Jenkins ..260/557 B Primary Examiner-Henry R. Jiles Assistant Examiner-Robert '1. Bond Anomey-Hans L. Bemeis and John Kekich [57] ABSTRACT wherein n and x are defined as above, and Hal is chlorine or bromine, with about 1 molar equivalent of an amine H,N-R,,

-in which R is defined as above. Compounds 11 have antidiabe'tic activity and can be used in mammals to treat hyperglycemia.

4 Claims, Ne

An exo-dibicycloalkanecarboxamide of the structural formula 1 y EXO-DIBICYCLOALKANE CARBOXAMIDES BACKGROUND OF THE INVENTION Field of the Invention The present invention is concerned with new organic compounds and more particularly with novel exo-dibicyclo-alkanecarboxamides II and the process of production therefor.

The novel compounds II and the process of production therefor can be illustratively represented as follows:

- wherein Hal is a halogen selected from the group consisting of PREFERRED EMBODIMENT OF THE INVENTION The formulae ll herein shown are depicted in the exo configuration, i.e. the chain OH ll H2)X N 1 is directed away from the bicycloalkane group. The endo compounds are depicted with the chain (In; -(CHz),,-(l-NR directed toward the bicycloalkane group. As the endo compounds are not orally active antidiabetics, they are not claimed.

The moiety;

(CH2)n can be cyclopentyl, cyclohexyl, or cycloheptyl, depending on whether n is l, 2, or 3. I

The group R refers to: alkyl groups [-6 carbon atoms, inclusive) e.g. propyl, isopropyl, butyl, isobutyl, t-butyl, pentyl, isopentyl, t-pentyl, and hexyl, as well as methyl, ethyl, and the like.

The substituted phenyl groups also include o-, m-, p-tolyl; om-, p-ethylphenyl, and propyl and isopropyl substituted phenyls, with the alkyls in o-, m-, and p-positions. Included also are phenyls substituted with fluorine, chlorine, bromine, iodine, -NO and CF,,, methoxy, ethoxy, propoxy, and isopropoxy in positions ortho, meta, or para, with respect to the attachment of the phenyl group to the N-atom in Compound II.

The compounds of the present invention are useful oral antidiabetic agents. In the past diabetes has been alleviated primarily by the use of insulin. Unfortunately, however, insulin cannot be given orally. Thus, the diabetics before the advent of sulfonylurea therapy for the treatment of diabetes 7 were faced with a lifetime of insulin injections necessary for the maintenance of bodily health. The compounds of the present invention thus provide a means for the relief of diabetes without the necessity of injections. The novel compounds II are not only capable of reducing blood sugar to -a safe level for a considerable period of time but, in addition,

1 also bring about satisfactory blood-sugar reduction atlow dosage levels.

For example, for tolbutamide the lowest closes with consistent hypoglycemic activity inthe glucose-primed, fasted, intact rat is about 25 mg./kg., whereas N-(2-pyridyl)exodibicyclo[3. l .0.]hexane-6-carboxamide exhibits the same activity at 6.25 mg./kg.

All blood sugar. determinations were made according to the following procedure:

Glucose-primed, fasted (18-24 hrs.), intact male rats are the test animal. The test compound is administered orally at a dosage of mg./kg. or less in 0.5 cc. sterile vehicle (6 rats/group). Immediately following administration of the test material, the animals are injected subcutaneously with mg. ofglucose in 1 ml. 0.9 percent saline. Two hours later the rats are bled, via the vena cava, while under Cyclopal anesthesia, and blood sugars were determined. A significant depressionof blood sugar from that of controls indicates activity.

For such oral administration the active compounds can be administered in liquid or solid dosage forms. Solid forms include capsules, tablets, powders, pills, and the like, and liquid forms include suitably flavored aqueous suspensions and solutions (depending on concentration desired), and flavored oil suspensions and solutions wherein edible oils, e.g., corn oil, cottonseed -oil, coconut oil, peanut oil, sesame oil, or mixture of these and the like can be employed.

For preparing compositions such as tablets and other compressed formulations, the composition can include any compatible and edible tableting material used in pharmaceutical practice, -e.-g., corn starch, lactose, stearic acid, magnesium stearate, talc, methyl cellulose, and the like.

Similarly, the compounds of the present invention can be mixed with suitable adjuvants for the preparation of resorbable hard gelatin or soft gelatin capsules utilizing conventional pharmaceutical practices.

The following illustrative compositions are within the scope of the present invention: I

1. Hard gelatin capsules l0,000 two-piece hard gelatin capsules for oral use, each containing 100 milligrams of N-(2- pyridyl)-exo-dibicyclo[3. l .0. ]hexane-6-car-boxamide are prepared from the following amounts and types of materials;

N-(2-pyridyl)-exo-dibicyclo[3. 1.0.] l 000 hexane-warboxamide Corn Starch Mineral oil, U. S. P.

Magnesium stearate, powder Talc, U. S. P.

l6l6 gm. 129.6 gm. 162 gm. 162 gm.

The finely powdered N-(2-pyridyl)-exo-bicyclo[3.1.0.]-

hexane-6-carboxamide is mixed thoroughly with the rest of dibicyclo[3.l.0.]hexane-6-carboxamide is prepared from the 5 Antioxidant 1 following types and amounts of materials:

.gm. gm. gm. Flavoring 25 ml.

, compressed into tablets, each containing 250 mgi of active inaqueous Solvent can'be used.

of materials:

. hexane 6-carboxamide 2500 gm.

Dicalcium phosphate 3050 gm. Methylcellulose, U. S. P. (l5 cps.) 65 gm. 10 Talc, bolted 450 gm. Calcium stearate, fine powder 35 gm.

The ingredients "mixed in" a conventional manner and grfedient.

' 5. Syrup-A sugar-free syrup for oral use. containing in each 5 milliliters 250 milligrams N-(2-pyridyl)exo-dibicyclo[3. 1.0.

]hexane,-6 -carboxamide is prepared from the following types and amounts of materials:

Deionized water q. s. to 10,000 ml.

A dose of l teaspoonful (5 ml.) to 1 tablespoonful ml.)

will give the patient 250 to 750 mg of N-(2-pyridyl)-exodibicyclo[ 3.. l .0. ]hexane-6-carboxamide.

The dosage of the novel compounds II of the present invention for the treatment of. diabetes depends on the age, weight, and condition of the patient being treated. Generally speaking for adult oral administration the preferred unit dosageis 50 to l ,000 mg. of active compounds with asuitable pharmaceutical diluent and/orzlubricant. One or two unit dosages are given one to four times a day. A total daily dose of from to 4,000 mg given singly, or preferably in divided doses, embraces the effective range forthe treatment of diabetes. 40

In addition to the foregoing principal active ingredients, the present compositions can also include, as supplementary active ingredients, other blood sugar lowering compounds, such as tolbutamide, chlorpropamide, and phenformin. Such supplementary ac tive' ingredients can be included in these compositions in amounts approximately equal to or less than the concentrations employed where each material are the sole active ingredients.

Starting compounds of structuralformula I of this invention are disclosed in the art and can .be prepared as shown in the art [c.g; "J. Meinwald et al., J. Am. Chem. Soc. 85, 582-585 1963)]and in the Preparations l-6.

In carrying out the process of this invention, the selected exo-bicycloalkane carboxylic acid as chloride or possible as bromide is reacted in solution with an amine l-l N-R wherein R has the value given before. The amine is used in 0.5 times molar equivalents per mole of acid halide; however, larger or lesser amounts will-still provide some diamide of fonnula II.

Thesolvents used in this reaction are organic solvents, inert toward the reactants'of this invention and liquid at the tem peratures herein used i.e. at room temperatures (2030 C.).

The reaction can be carried out between about 10 to 50 C.

Carbontetrachloride, chloroform, methylene chloride,

benzene,'-toluene, ether, tetrahydrofuran, and the like can be 7 Anal. calcd. for C l-L 0 used as solvents. If the amine above is ammonia, a partially The reaction time which varies with the reaction temperature, reagents, solvents,'and the like, can be between one-half hour and 48 hours ormore. At the termination of the reaction,

the desired product is separated by conventional procedures, for example by extraction, chromatography, crystallization, distillation and the like. i

The following" Preparations and Examples are illustrative of the products of the present invention, but are not to be con- 7 struedaslimiting.-

Preparation 1 Bicyclo[ 3. l .0. lhex-2-ene-6-endo-carboxaldehyde To a rapidly stirred suspension ,of 392.0 g. (3.7 moles) of anhydrous sodium carbonate in a solution of 276.4 g. (3.0 moles) of bicyclo[2.2.l.']heptadiene in "1.7 l. methylene chloride was added 285 g. of 40 percent peracetic acid, which had been previously treated with 7.53. sodiumacetate. The I temperature was maintained at about 20 C. duringthe addition which required about 2 hours. Thereaction mixture was stirredfor an additional 2 5% hours and'allowedto stand overnight. The inorganic solids were filtered off and washed with methylene chloride. The methylene chloride (filtrate and wash) was distilled from the filtrate through a Vigreux column and the residual yellowoil (about was directly inthenextstepm v H l Preparation 2 Bicyclo[3. li0.lhex-2 ene-6 endo-carboxylic acid Y The acid was preparedby a slightly modified procedure. I

The crude bicyclo[3.l.0.]hex-2-ene-o-endo carboxaldehyde from the previous stepwas mixed-with 850 (5.0- moles) silver nitrate, 2 l. of water and ll. of percent ethanol and stirred vigorously. A solution of 300 g.-(7.5 mol'es)'of sodium hydroxide in 4 l. of water was added over a period of 3 hours. The reaction is slightly exothermic. The mixture was allowed to stand overnight and the solids were filtered through Celite and washed with water. The filtrate was extracted with 3 X l l. of methylene chloride and the extracts were discarded. The aqueous phase was acidified with 280 ml. of-concentrated hydrochloric acid and extracted with '6 X 1 l. methylene chloride. The extract was dried over anhydrous sodium sulfate and the solvent was removed under vacuum to give 148 g. of yellow crystals Crystallization from about 8 00-rnl. Skellysolve B hexanes and through (Darco)activated charcoal gave 131.7 g. of olf-whitecrystals of bicyclo[3.l.0. hex-2 ene-6-endocarboxylic acid of melting point 88"- -9l C. Overall yield (from bicyclo[2.2. l .]hep'tadiene) was 71 percent. I Preparation 3 Bicyclo[3.1.0.]hexane-6-endo-carboxylic acid Bicyclo[3.l.0.]-hex-2-ene-fi-endo-carboxylic acid (131 g., 1.05 moles) was divided into 5 equal portions. Each was dissolved in 200 ml. absolute ether, 0.5 g. platinum oxide was added and the solutions were hydrogenated in a Parr Hydrogenator at an initial pressure of 50 lbs. until the hydrogen: uptake ceased (6-8 minutes). The bottles were allowed to-cool, the catalyst was filtered off and the combined filtrates were evaporated. The residue was vcrystallized from 350 ml. of Skellysolve B hexanes to yield 188 g. (89 percent) of white needles of bicyclo[3.l.0.]-hexane 6-endo-carboxylic acid in two cropsof melting point. 82-85 C. Preparation '4 Methyl Bi'cyclo[ 3. L0. lhexane-o-endo-car-box ylate 7 v Bicyclo[3.l.0.]hexane6-endo-ca.rboxylic acid (18.9 g., 0.15 mole) was added in small portion to an etheral solution of diazomethane. The reaction mixture wasallowed to stand overnight and the excess diazomethane was destroyed by the addition of acetic acid. Half the ether was distilled and the concentrated solution was extracted twice .with aqueous sodium bicarbonate followed by saturated salt solution. After drying the ether layer over magnesium sulfate, the solvent was distilled on the steam bath. Distillation of the residue under reduced pressure gave 19.8 g. (94 percent) of methyl bicyclo[ 3. l.0.]hexane-6-endocarboxylate as a colorless oil, of v boiling point 7 l-73 C. v

H8 Found: ;H, 8.

product was dissolved in Skelly-solve B hexanes. The organic layer was separated from a small water layer and then treated with Darco activated charcoal. The resulting colorless solution was concentrated to circa 40 ml. and refrigerated to yield 12.4 g. (76 percent) of exo-bicyc1o[3. l.0.]hexane-6-carboxylic acid in large colorless plates of melting point 59.5-61.5 C. Preparation 6 Exo-bicyclol3.1.0.]hexane-6-acetic acid Exo-bicyclo[3.1.0.]hexane-6-formyl chloride (5.8 g.; 0.040 moles) was added insmall portions over a period of minutes to the well stirred diazomethane solution maintained at 3 to 5 by means of an ice bath. After 30 minutes, stirring was discontinued and the reaction vessel was removed from the ice bath and allowed to warm to room temperature. An inverted recrystallizing dish was placed over the neck of the flask in order to minimize the loss of diazomethane through evaporation. I

The reaction flask was allowed to stand undisturbed for three days in a well ventilated hood. It was then transferred to a beaker and the solution allowed to evaporate. The crude residue thus obtained was shown to contain the desired diazoketone by its infrared and nmr spectra. It was subjected to a Wolff rearrangement without purification.

The well stirred solution of the crude diazoketone in absolute methanol (300 ml.) at room temperature was treated with a fresly prepared solution of silver benzoate (3.0 g.) in triethylamine (30 ml.). Bubbles of gas were almost immediately emitted. When the bubbling subsided additional silver benzoate solution (1 g. of silver benzoate in 10 ml. of the triethylamine) was added. Stirring was continued for 1 hour and then the reaction mixture was allowed to stand for several days. It was then filtered through a pad of diatomaceous earth (Celite) and concentrated in vacuo to a viscous brown oil. This was dissolved in ether (400 ml.) and washed successively with water (2 X 250 ml.), 1 N hydrochloric acid (2 X 250 ml.) and finally with aqueous saturated sodium bicarbonate (2 X 400 ml.). The ether solution was dried over anhydrous magnesium sulfate. This was concentrated in vacuo to a red oil which, when subjected to vacuum distillation, gave 1.96 g. (32 percent overall yield) of methyl exo-bicyclo[3. l .O.]-hexane-6- acetate as pale green oil ofboiling point 70 C. at 3.0 mm. Hg.

The above ester 1.96 g.; 0.013 moles) dissolved in ethanol 10 ml.) was combined with a 20 percent (w/v) potassium carbonate solution (40 ml.) and heated under gentle reflux with rapid stirring for 2 hours. After cooling to room temperature, the reaction mixture was diluted with water (200 ml.) and washed with ether (2 X 200 ml.). Theaqueous layer was then acidified with 2.5 N sulfuric acid and the resultant suspended oil extracted with ether (2 X 150 ml. The combined ether extracts were dried overnight over anhydrous magnesium sulfate. Concentration in vacuo gave a nearly colorless, clear oil (1.4 g.). Vacuum distillation of this oil gave 1.05 g. (58 percent yield) of ex0-bicyclo[3.l.0.]hexane-6-acetic acid as a clear, colorless, noncrystallizable liquid, of boiling point 82 C. at 0.1 mm. Hg. The yield over all (from the acid chloride) was 18.5 percent.

Anal. calcd. for C H O J Found:

These acids from the Preparations together with thionyl chloride and thionyl bromide are used to make, in conventional manner, the acid chlorides and acid bromides of formula I, used as starting materials.

Example 1 Ex0- dibicyc1o[3. l .0.]hexane-6-carboxamide Aqueous ammonia (30 percent; 25 ml.) was added dropwisewith stirring to exo-bicyc1o[3.1.0.]hexane-6-formyl chloride (1 1.4 g.; 0.079 moles) dissolved in chloroform (100 ml. maintained at 2025 C. by means of a water bath. After being stirred vigorously for two additional hours the solvent and excess ammonia were removed in vacuo and the residue was recrystallized to afford exo-dibicyclo[3.1.0.]hexane-6- carboxamide.

Example 2 Exo-dibicyclo[4. l .0.]heptane-7-carboxamide.

In the m'annergiven in Example 1, aqueous ammonia was added to exo-bicyclol4.1.0.]heptane-7-formyl chloride in chloroform at room temperature to give exo-dibicyclo- [4. l .0.]heptane-7-carboxamide.

Example 3 Exo-dibicyclo[5. 1.0.]octane-8-carboxamide.

In the manner given in Example 1, aqueous ammonia was added to exo-bicyclo[5.1.0.]octane-8-formyl bromide in chloroform at room temperature to give exo-dibicyclo- [5.1.0.]octane-8-carboxamide.

Example 4 Exo-dibicyclo[ 3. 1.0.]hexane-6-acetamide In the manner given in Example 1, aqueous ammoniawas added to exo-bicyclo[3.1.0.]hexane-6-acetyl chloride in chloroform at room temperature to give exo-dibicyclo- [3.1.0.]hexane-6-acetamide. Example 5 Exo-dibicyclo[4. 1.0.]heptane-7-acetamide In the manner given in Example 1, aqueous ammonia was added to exo-bicyclo[4.1.0.]heptane-7-acetyl chloride in chloroform at room temperature to give exo-dibicyclo- [4. 1 .0.]heptane-7-acetamide. Example 6 Exo-dibicyclo[5. 1.0. ]octane-8-acetamide In the manner given in Example 1, aqueous ammonia was added to exo-bicyclo[5.1.0.]octane-8-acetyl bromide in chloroform at room temperature to give exo-dibicyclo- [5.1.0.]octane-8-acetamide. Example 7 Exo-dibicyclo[3. l .0.]hexane--carbox-p-aniside A solution of p-anisidine (0.039 moles) and 8.8 g. (0.16 moles) of triethylamine in ml. of chloroform was added dropwise to exo-bicyclo[3.1.0.]hexane-6-formyl chloride (1 1.4 g., 0.079 moles) in 50 ml. of chloroform maintained at 202S C. in a water-bath. The reaction mixture was evaporated to dryness and the pasty solid was agitated vigorously with 3N hydrochloric acid (150 ml.) for 15 min. It was then washed thoroughly with water, followed by 10 percent sodium bicarbonate. After a final washing with water the solid was partially dried in air and then dried overnight under vacuum at 35 in a slow stream of nitrogen. One recrystallization from chloroform containing a small amount of n-hexane gave exo-dibicyclo[3. 1.0.]-hexane-o-carbox-p-aniside. Example 8 Exo-dibicyclo[3. 1.0.lhexane--carboxanilide In the manner given in Example 7, aniline and triethylamine in chloroform at room temperature were added to exobicyc1o[3.1.0.]hexane-6-formyl chloride in chloroform to give exo-dibicyclo[ 3. l .O.hexane-6-carboxanilide.

Example 9 Exo-dibicyclol3.1.0.]heptane-7-carbox-m- (nitroanilide) 1n the manner given in Example 1, m-nitroaniline was added at room temperature to exo-bicyclo[4.1.0.]heptane-7-formyl bromide in chloroform to give exo-dibicyclo-[4.1.0.]heptane- 7-(carbox-m-nitroanilide).

Example 10 Exo-dibicyclo[5. 1.0.]octane-7-carbox-mtoluidide.

In the manner given in Example 1, m-toluidine at room temperature was added to exo-bicyclo[5. 1 .0.]octane-7-formyl chloride in chloroform to give exo-bicyclo[5.1.0.]0ctane-7- carbox-m-toluidide.

Example 1 1 Exo-dibicyclo[ 3. 1 .0. ]hexane-6-carbox-(o-chloro anilide) In the manner given in Example 1, o-chloroaniline at room temperature was added to exo-bicyclo[3.1.0.]hexane-6-formyl bromide in chloroform to give exo-dibicyclo[3.l.0.]-hexane- 6-carbox-( o-chloroanilide Example 12 Exo-dibicyclo[4. l .0.]heptane-7-carbox(mtrifluoromethylanilide) In the manner given in Example 1, m-trifluoroaniline at room temperature was added to exo-bicyclo[3.1.0.]heptane- 7-formyl bromide in chloroform to give exo-dibicyclo-[4.1.0.] heptane-7-carbox-(m-trifluoromethylanilde).

Example 13 Exo-dibicyclo[5.1.0.]octane-8-acet-(misopropoxyanilide) In the manner given in Example I, m-isopropoxyaniline at room temperature was added to exo-bicyclo[3.1.0.]octane-8- acetyl chloride in chloroform to give exo-dibicyclo-[5.1.0.]octane-8-acet-(m-isopropoxyanilide). Example 14 Exo-dibicyclo[ 5 1 .0. ]octane-8-acet-(pbromoanilide) In the manner given in Example I, p-bromoaniline at room temperature was added to exo-bicyclo[3.1.0.]octane-8-acetyl chloride in chloroform to give exo-dibicyclo-[5.1.0.]octane-8- acet-(p-bromoanilide).

Example 15 Exo-dibicyclo[3.l.O.]hexane6-N-methylcarboxamide In the manner given in Example 1, aqueous methyl ammonia was added at room temperatureto exo-bicyclo[3.1.0.]- hexane-6-formyl chloride in chloroform to give exodibicyc1o[ 3. 1 .0hexane-6-N-methylcarboxamide.

Example 16 Exo-dibicyclo[4.1.0.]heptane-7-N-hexy1acetamide In the manner given in Example 1, monohexylamine at room temperature was added to exo-bicyclo[4.1.0.]heptane- 7-acetylchloride in chloroform to give exo-dibicyclo-[4.1.0.] heptane-7-N-hexylacetarnide. Example 17 Exo-dibicyclo[5.1.0.]octane8-N-butylcarboxamide) In the manner given in Example 1, aqueous butyl ammonia was added at room temperature to exo-bicyclo[5.1.0.]oxtane-8-formyl bromide in chloroform to give exodibicyclo[ 1 .0.octane8-N-butylcarboxamide.

Example 18 N-(2-pyridyl)-exo-dibicyclo[3.1.0.]hexane-6-carboxamide.

2Aminopyridine (-82.0 g; 0.087 m) and triethylamine (17.6 g.; 0.174 m) in 100 ml. of chloroform was stirred well and added dropwise to exo-bicyc1o[3.1.0.]hexane-6-formyl chloride (22.8 g.; 0.185 mole) in 50 ml. ofchloroform.

There was obtained a yellow oil which crystallized on standing overnight at l5. Recrystallization from n-hexane gave 1.1 g. of N-(2-pyridyl)-exo-bicyclo[3.1.0.]hexane-6-carboxamide as light tan needles of melting point l22-123.5 C. The filtrate was concentrated by one-half and chilled at 1 5 overnight to afford-a second crop of crystals (0.2 g. This was subjected to absorption chromatography on 50 g. of silica gel. The column was eluted with 300 ml. of 1:1 toluene-acetic acid. Fifteen fractions were collected. From fractions one to three there was obtained, after one recyrstallization from nhexane, 0.3 g. of N-(2-pyridyl)-exo-bicyclo[3.1.0.]hexane-6- carboxa-mide of melting point l23l24 C.

Fractions five to gave 3.6 g. of N-(2-pyridyl)-exodibicyclo[ 3. l .0.]hexane-6-carboxamide which after recrystallization gave white needles of N-(2-pyridyl)-exodibicyclo[3.1.0.]hexane-6-carboxamide of melting point 149.5l4lC.

Anal. calcd. for C I-1 N 0 C, 73.53; H, 7.14; N, 9.03.

Found: C, 73.75; H, 7.30; N, 9.30.

Example 19 N-(2-pyridyl)-exo-dibicyclo[5.1.0.]octane-8-carboxamide In the manner given in Example 18, Z-aminopyridine and triethylamine was added to exo-bicyclo[5.1.0.]-octane8-formyl chloride to give N-(Z-pyridyl)-eXo-dibicyclo-[5.1.0.]0ctane-8-carboxamide which was recovered by chromatography as in Example 18.

Example 20 N-(2-pyridyl)-exo-bicyclo[4.1.0.]heptane-7-carboxamide.

In the manner given in Example 18, 2-aminopyridine and triethylamine was added to exo-bicyclo[4.1.0.]heptane-8-formyl chloride to give N-(Z-pyridyl)-exo-dibicyclo-[4.1.0.]heptane-8-carboxamide which was recovered by chrom-atography as in Example 18.

Example 21 N-(2-pyridyl)-exo-dibicyclo[4.1.0.]heptane-7- acetamide.

1n the manner given in Example 18 Z-aminopyridine and triethylamine was added to exo-bicyclo[4.1.0.]heptane-7- acetyl chloride to give N-( 2-pyridyl)-exo-dibicyclo-[4.1.0. ]heptane-7-acetamide which was recovered by chromatography as in Example 18.

Example 22 N-(2-pyridyl)exo-dibicyclo[5.l.O.]octane-8- acetamide In the manner given in Example 18 2-aminopyridine and triethylamine was added to exo-bicyclo[5.1.0.]octane-8- acetyl chloride to give N-( 2-pyridyl)-exo-dibicyclo-[5.l.0.

]octane-8-acetamide which was recovered by chromatography as in Example 18.

In the manner given in the preceding Examples reacting an amino compound H NR, as defined above with a formyl or acetyl exo-bicycloalkane of formula I other exobicycloalkane acid amide of formula II are obtained. Representative compounds thus obtained, include:

Eire-dibicyclo[ 3. l .0.]hexane-6-(N-ethylcarboxamide);

Exo-dibicyc1o[3 .1.0.]hexane-6-(N-propylcarboxamide);

Exo-dibicyclof3.1.0.]hexane-6-(N-isopropylcarboxamide);

Exo-dibicyclo[ 3. 1.0.]hexane-6-(N-isobutylacetamide);

Exo-dibicycloP. 1 .0. hexane-6-(N-pentylacetamide);

Exo-diblcyclo 3.1.0. hexane-6-(N-isohexylacetamide);

Exo-dibicyclo[4. 1 .0. ]heptane-7 N-methylcarboxamide Exo-dibicyclo[4. l .0. ]heptane-7-( N-methylacetamide);

Exo-dibicyclo[4. 1 .0.]heptane-7-( N-isobutylcarboxamide);

Exo-dibicyclo[4. 1.0.]heptane-7-(N-isopentacetamide);

Exo-dibicyclo[4. 1 .0.]heptane-7-(N-hexylcarboxamide Exo-dibicyclo[5. l .0.]octane-8-(N-methylacetamide);

Exo-dibicyclo[5. l .0.]octane-8-( N-ethylcarboxamide);

Ecodibicyclo[ 5 1 .0. ]octane-8-( N-hexaylacetamide Exo-dibicyclo[5. 1 .0. ]octane-8%N-pentylcarboxamide);

Exo-dibicyclo[ 3. l .0. ]hexane-6-(carbox-o-iodoanilide Exo-dibicyclo[ 3. l .0. ]hexane-6-carbox-( ptrifluoromethylanilide);

Exo-dibicyclo[3.1.0.]hexane-6-carbox-(o-nitroanilide);

Exo-dibicyclo[4. l .0. ]heptane-7-carboxanilide;

Exo-dibicyclo[4.1.0.]heptane-7-carbox -(m-propylanilide Exo-dibicyclo[5. l .0. ]octane-8-carboxanilide;

-Exo-dibicyclo[ 5 l .0. ]octane -8-carbox-( m-trifluoromethylanilide Exo-dibicyclo[5. l .0. ]octane-8-carbox(o-fluoroanilide Exo-dibicyclo[5. l .0. ]octane-8-carbox(o-bromoanilide);

Exo-dibicyclo[5.1.0.]octane-8-carbox-(o-iodoanilide);

Exo-dibicyclo[3.1.0.]hexane-6-acet-(o-iodoanilide);

Exo-dibicyclo[3.1.0.]hexane*6-acet-(p-trifluoromethylanilide);

Exo-dibicyclo[3.1.0.]hexane-6-acet-(o-nitroanilide);

Exo-dibicyclo[4. l .0. ]heptane-7-acetanilide;

Exo-dibicyclo[4. l .0.]heptane-7-acet-( m-propylanilide);

Exo-dibicyclo[5. l .0. ]octane-8-acetanilide;

Exo-dibicyclo[ 5. l .0. ]octan-8-acet( m-trifluoromethylanilide Exo-dibicyclo[ 5. l .0. ]octane-8-acet( o-fluoroanilide Exo-dibicyclo[5. l .0.]octane-8-acet( o-bromoanilide Exo-dibicyclo[ 5. l .0. ]octane-8-acet( o-iodoanilide N-(Z-pyridyl)-exo-dibicyclo[3.1.0.]hexane-6-acetamide; and the like.

I claim:

1. An exo-dibicycloalkane amide of the formula:

wherein n has the value of I to 3, inclusive; wherein x is zero or 1; wherein R, is selected from the group consisting of hydrogen, alkyl of one to six carbon atoms, inclusive, 2-

pyridyl. phenyl and substituted phenyl in which the substituent zero, R is p-methoxyphenyl, so that the compound is exodibicyclo[ 3. l .O.hexane-6-carbox-p-aniside.

4. A compound according to claim 1, wherein n is 1; x is zero, R is Z-pyridyl, so that the compound is N-(2-pyridyl)- exo-dibicyclo[ 3. 1.0.]hexane-6-carboxamide. 

2. A compound according to claim 1 wherein n is 1, x is zero, and R1 is hydrogen, so that the compounds is exo-dibicyclo(3.1.0.)hexane-6-carboxamide.
 3. A compound according to claim 1, wherein n is 1; x is zero, R1 is p-methoxyphenyl, so that the compound is exo-dibicyclo(3.1.0.)hexane-6-carbox-p-aniside.
 4. A compound according to claim 1, wherein n is 1; x is zero, R1 is 2-pyridyl, so that the compound is N-(2-pyridyl)-exo-dibicyclo(3.1.0.)hexane-6-carboxamide. 